Automatically switching dual air filter



FIG. 1 is a perspective view of the automatically switching dual air filter showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevation view thereof; and,

FIG. 7 is a right side elevation view thereof.

Portions of the article shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for an automatically switching dual air filter, as shown and described. 